1996 Peterbilt 379EXHD3406E CAT 550HP18 speed3:55 Rears63 flat top unibilt sleeper304Wheelbase on flex air. Truck has been stretched but its a show room job and they added on the back end and sleeved it and filled any holes. Truck had stand up sleeper on it when I bought it, I pulled it off and had the flat top put on it. The interior does not match, the cab has the maroon American class and the sleeper is grey American Class. Don"t have any real history on the truck other than the motor was said to have 450,000 on it when I bought it, have no paperwork on it. Really don"t know much about it other than it runs good and has no vibrations going down the road. Paint is brand new and both sleeper air bags are new, also the radiator had a leak so I replaced that. Other than that I know nothing about the truck. I was just fixing it up for a spare truck.